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SubjectRe: Purpose of the mm/slab.c changes

On 09-Sep-2001 Rik van Riel wrote:
> On Sun, 9 Sep 2001, Davide Libenzi wrote:
>
>> Do You see it as a plus ?
>> The new allocated slab will be very likely written ( w/o regard
>> about the old content ) and an L2 mapping will generate
>> invalidate traffic.
>
> If your invalidates are slower than your RAM, you should
> consider getting another computer.

You mean a Sun, that uses a separate bus for snooping ? :)
Besides to not under estimate the cache coherency traffic ( that on many CPUs
uses the main memory bus ) there's the fact that the old data eventually
present in L2 won't be used by the new slab user.




- Davide

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